CN202363898U - Anti-strong-current weak-current network - Google Patents
Anti-strong-current weak-current network Download PDFInfo
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- CN202363898U CN202363898U CN2011205212889U CN201120521288U CN202363898U CN 202363898 U CN202363898 U CN 202363898U CN 2011205212889 U CN2011205212889 U CN 2011205212889U CN 201120521288 U CN201120521288 U CN 201120521288U CN 202363898 U CN202363898 U CN 202363898U
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Abstract
The utility model discloses an anti-strong-current weak-current network, comprising a first module, a second module to be protected and an overcurrent protection element. The first module and the second module are connected by at least two weak-current lines; and the overcurrent protection element is in series connection in at least one of the weak-current lines. The weak-current network can effectively protect the devices in the weak-current network from damage caused by strong current and improve the safety performance of the weak-current network.
Description
Technical field
The utility model relates to a kind of light current network, and especially a kind of forceful electric power that can prevent is introduced, and causes the light current network of equipment damage in the light current network.
Background technology
Be divided into strong power part and weakness part in the industrial control system at present, wherein the weakness part mainly comprises low-voltage equipment and network systems such as communication network, transducer.These weakness transducer or network equipment partly generally moves in the environment of the low-voltage signal of human body safety; Therefore when running into forceful electric power, weakness physical circuit partly seals in; After perhaps the misconnection of forceful electric power signal was gone into, the lightning surge phenomenon partly appearred in weakness, occurred big electric current, high voltage signal in the circuit; Tend to cause burning even exploding of weakness equipment such as transducer or communication equipment, cause serious engineering accident.
In the RS584 communication network, communication controler sends signal through two bars buses to the last slave station that is suspended on this signal bus.But in the engineering practice that connects slave station; Often misoperation or other reasons that the workman occurs; Cause forceful electric power is introduced among the communication network, not only can cause the damage and the blast of communication equipment, cause communication disruption; System equipment can't run well, and causes huge engineering accident and economic loss.
The utility model content
To the problems referred to above, the purpose of the utility model is to provide a kind of forceful electric power that prevents to introduce, and causes the light current network of equipment damage in the light current network.
For realizing above-mentioned purpose, the technical scheme of the described light current network using of the utility model is following:
A kind of light current network of overcurrent proof; Comprise one first module and second module to be protected; Connect through at least two light current circuits between said first module and second module, also comprise an overflow protecting element, said overflow protecting element is serially connected among at least one said light current circuit.
Concrete, said overflow protecting element is a resettable fuse.
Further, also comprise at least one current-limiting resistance, said current-limiting resistance is connected in the said light current circuit.
Further, also comprise the voltage protection element of being located between the two light current circuits.
Concrete, said voltage protection element is a gas amplifier tube.
Further, also comprise first Transient Suppression Diode that at least one and said gas amplifier tube is parallelly connected.
Further, also comprise at least one second transient state diode, the said second transient state diode, one end is connected with said light current circuit, an other end ground connection.
Preferably; Said resettable fuse is connected in the light current circuit near said second module side of gas discharge tube; The said first transient state diode is located between the light current circuit near said second module side of said resettable fuse, and is parallelly connected with said gas discharge tube.
Further, said current-limiting resistance is connected in the light current circuit of the said first transient state diode near said second module side.
Further, the link of said second transient state diode and light current circuit is located among the light current circuit between said second module and the current-limiting resistance.
With respect to prior art, the described light current network of the utility model reduces the big current signal that gets into wherein through resettable fuse, and through current-limiting resistance big current signal is done further restriction; Through the gas amplifier tube high voltage in the circuit is tentatively released, through the transient state diode with voltage limit in a safe voltage, further protect through the transient state diode of ground connection.Through the effect of protective device, can remove these high-octane interference signals, guarantee the normal operation of light current network.
For purpose, characteristic and the effect of understanding the utility model fully, below will combine accompanying drawing that the technique effect of design, concrete structure and the generation of the utility model is described further.
Description of drawings
Fig. 1 is the structural representation that the utility model is applied to the protective device in the low-voltage circuit;
Among the figure:
1-second module; 2-first module; 3-light current circuit; The 31-resettable fuse; The 32-current-limiting resistance; The 33-gas discharge tube; 34-first Transient Suppression Diode; 35-second Transient Suppression Diode.
Embodiment
See also Fig. 1, shown in Figure 1 is the structural representation of the utility model one embodiment, has shown a kind of light current network of overcurrent proof.Specifically can there be various ways in this light current network, like the low-voltage power network of supplying power to low-pressure section through low-tension supply, and communication network of RS485 or the like.Below through one be applied in the communication network of RS485 protective device the structure and the effect of this protective device is elaborated.
In the RS485 communication network, first module 2 can be other equipment and the circuit that exists in the communication network, and second module 1 links together first module 2 and second module 1 through light current circuit 3 for to be connected the communication controller in the communication network.In order to prevent in light current circuit 3, to be connected into big current signal, also be in series with at least one over-current protecting element in the low-voltage circuit 3.
Over-current protecting element can be a self-healing fuse 31, and it adopts the macromolecule organic polymer under the condition of high pressure, high temperature and vulcanization reaction, to process.The current ratio that in low-voltage circuit 3, flows through hour, the heat of generation is few, can not change the crystal structure in the fuse, forms conductive path; But after introducing forceful electric power in the low-voltage circuit, the heat that the big electric current that wherein flows through produces is that polymerization numerical value melts, and volume increases rapidly, forms high-impedance state and makes the electric current in the low-voltage circuit reduce rapidly, thereby circuit is limited and protects.After fault was got rid of, resettable fuse is crystallisation by cooling again, volume contraction, and resettable fuse reverts to low resistive state.
In order further to reduce the electric current in the light current circuit 3, can also be connected in series some current-limiting resistances 32 in the line, further protect the light current network.
Because the forceful electric power that misoperation or other reasons insert in the low-voltage circuit generally all is a high voltage signal, therefore need to reduce the voltage between the light current circuit 3.Through reducing the electrical potential difference between the light current circuit 3 at least one pressure limiting element of connection between the light current circuit 3.As preferred embodiment a kind of, can between low-voltage circuit, be connected in series an at first gas discharge tube 33, through gas discharge tube 33 with the voltage limit between the light current circuit 3 about the 380V that exchanges.In order further to reduce the voltage between the light current circuit 3, can be once more between two light current circuits serial connection one first Transient Suppression Diode 33 in 3, with the voltage limit between the two light current circuits 3 that connect about 6.5V.
For the forceful electric power signal is flowed out; Can between light current circuit 3 and the earth, be connected in series at least one second Transient Suppression Diode 35; Unnecessary forceful electric power signal is released in the middle of greatly through the second transient state diode 35, thereby better light current circuit 3 is protected.
It should be noted that as a more excellent execution mode, should be noted that the annexation of each element.Because general forceful electric power is introduced from first module 2, can be at first gas discharge tube 33 be arranged near the position of first module 2, can tentatively reduce the forceful electric power of introducing; Be connected in series at least one self-reparability fuse 31 respectively at the two light current circuits 3 that connect gas discharge tube 33 then, reduce the big electric current in the circuit.The one first transient state diode 34 parallelly connected with gas discharge tube 33 is set between the light current circuit 3 of self-reparability fuse 31 away from gas discharge tube 33 ends again; The forceful electric power signal voltage is reduced to about the 6.5V; Current-limiting resistance 32 is set in light current circuit 3 at last, further limits the electric current in the light current circuit 3, at last the second transient state diode 35 is being set near the position of communication controller 1; Forceful electric power signal converting residual in the circuit is gone into the earth, reach the purpose of protection second module 1.
With respect to prior art, the protective device of present embodiment reduces the big electric current that gets in the light current circuit 3 through resettable fuse, and through current-limiting resistance big current signal is further limited; Through the gas amplifier tube high voltage in the circuit is tentatively released, through the transient state diode with voltage limit in a safe voltage, further protect through the transient state diode of ground connection.Through the effect of protective device, can remove these high-octane interference signals, recover the normal operation of low-voltage circuit.
More than describe the preferred embodiment of the utility model in detail, the ordinary skill that should be appreciated that this area need not creative work and just can make many modifications and variation according to the design of the utility model.Therefore, all technical staff in the art according to the utility model design on the prior art basis through logic analysis, reasoning perhaps according to the available technical scheme of limited experiment, all should be among determined protection range by these claims.
Claims (10)
1. the light current network of an overcurrent proof; Comprise one first module and second module to be protected; Connect through at least two light current circuits between said first module and second module; It is characterized in that, also comprise an overflow protecting element, said overflow protecting element is serially connected among at least one said light current circuit.
2. light current network as claimed in claim 1 is characterized in that, said overflow protecting element is a resettable fuse.
3. light current network as claimed in claim 2 is characterized in that, also comprises at least one current-limiting resistance, and said current-limiting resistance is connected in the said light current circuit.
4. light current network as claimed in claim 3 is characterized in that, also comprises the voltage protection element of being located between the two light current circuits.
5. light current network as claimed in claim 4 is characterized in that, said voltage protection element is a gas amplifier tube.
6. light current network as claimed in claim 5 is characterized in that, also comprises first Transient Suppression Diode that at least one and said gas amplifier tube is parallelly connected.
7. light current network as claimed in claim 6 is characterized in that, also comprises at least one second transient state diode, and the said second transient state diode, one end is connected with said light current circuit, an other end ground connection.
8. light current network as claimed in claim 7; It is characterized in that; Said resettable fuse is connected in the light current circuit near said second module side of gas discharge tube; The said first transient state diode is located between the light current circuit near said second module side of said resettable fuse, and is parallelly connected with said gas discharge tube.
9. light current network as claimed in claim 8 is characterized in that, said current-limiting resistance is connected in the light current circuit of the said first transient state diode near said second module side.
10. light current network as claimed in claim 9 is characterized in that, the link of said second transient state diode and light current circuit is located among the light current circuit between said second module and the current-limiting resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205212889U CN202363898U (en) | 2011-12-13 | 2011-12-13 | Anti-strong-current weak-current network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205212889U CN202363898U (en) | 2011-12-13 | 2011-12-13 | Anti-strong-current weak-current network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202363898U true CN202363898U (en) | 2012-08-01 |
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ID=46575054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205212889U Expired - Fee Related CN202363898U (en) | 2011-12-13 | 2011-12-13 | Anti-strong-current weak-current network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202363898U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104394679A (en) * | 2014-12-10 | 2015-03-04 | 张毓 | Circuit capable of reducing influence of strong electrical field during coexistence of strong and weak electricity |
| CN104994269A (en) * | 2015-07-22 | 2015-10-21 | 杭州海康威视数字技术股份有限公司 | Power supply equipment and power supply control method and device for image acquisition equipment |
-
2011
- 2011-12-13 CN CN2011205212889U patent/CN202363898U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104394679A (en) * | 2014-12-10 | 2015-03-04 | 张毓 | Circuit capable of reducing influence of strong electrical field during coexistence of strong and weak electricity |
| CN104994269A (en) * | 2015-07-22 | 2015-10-21 | 杭州海康威视数字技术股份有限公司 | Power supply equipment and power supply control method and device for image acquisition equipment |
| CN104994269B (en) * | 2015-07-22 | 2018-10-19 | 杭州海康威视数字技术股份有限公司 | Power supply unit, method for controlling power supply and device for image capture device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120801 Termination date: 20121213 |